Rotary drum machine



Novl 1s, 1930.

ROTARY bRUM MACINE Filed Jan. 12, 192e Harry L .Myers -H. H. WOLFE EKT AL 5 Sheets-Sheet l 5 Sheets-Sheet 2 Nov. 18, 1930, H. H. woLFE E'rAL ROTARY DRUM MACHINE VFiled Jan. 12, 1928 Inuent'or:

Harry A' Harry L. Myers Nov. 18, 1930.

H. H. WOLFE ET Al.

ROTARY DRUM MACHINE Filed Jan.

12, 1928 5 Sheets-Sheet 3 y nfve tors HarryHWoZje 'HarryL lyers Nov. 18, 1930, H. H. woLFE ET AL ROTARY DRUM MACHINE Filed Jan. 12, 1928 5 Sheets-Sheet 4 `lafwfy HWolfe Y Harry Nov l8`, 1930. y i H. H. woLFE ET AL. 1,782,376

ROTARY DRUM MAHINE F'iled` Jan. l2, 1928 5 Sheets-Sheet 5 Inventor;

Ha ffy .dfe Harry L .Myers Patented Nav; is, leso UNTTED; STATES PATENT .ori-ics HARRY H. WOLFE' A'ND' HARRY L. MYERS, OF TOLEDO, OHIOQASSIGNORS T0 THE AMERICAN FLOOR SURFACING MACHINE COMPANY, F TOLEDO, OHIO ROTARY DRUM MACHINE Application led January 12, 1928. Serial No. 246,198.

This invention relates to an improved 'loor surfacing machine of the vertically tiltable rotary abrasive drum type, employed for conditioning and finishing floors of various` kinds. l

What we have endeavored to do, beyond what hasalready been done, in this particular art, is vto develop a` comparatively lightweight motor dri'venmachine capable of be-r ing moved by manual power over the surface, wherein the improved machine is characterized by a novel truck arrangement and associated details.

l The present-day machines of this specific classification usually include a main body, a source of power, a horizontally disposed abrasive drum at the front of the body, a

rear guide caster, anda fulcrum forming truck whichv 'is.located between Ethe drum" and the caster'.

' With this arrangement, arigid handle is provided att-he rear'of the body and the operator grasps this'handle, lifts up on the rear portion of the body,-swingingthe front end portion down, thus using the truck wheel axles as a Afulcrum for the body.` This methodo'f use therefore requires the expenditure'of considerable manual energyonthel part of the operator, in order to bring the., v abrasive drumintov firm abradlng contact` Bearing in mindthe disadvantages andr lobjections which accompany an arrangement V of' this kind, we have devised an improved I i organization of parts which eliminates the usual stationary fulcrum truck, and embodies .instead a novel adjustable 1 truck.'

whose construction and position on the bodyv permits' the accomplishment of several im 40x-portant results.

y First.. the truck, which is, ofthe two;

wheeledv type, is connected to fthe-body NNthrough the medium of a jack structure, thus 'permitting the truck wheels to b e esi-p 4 5 tended below 'the body and the drum'yorpermitting them to be retracted or withdrawn y tails. Y

Flg. 2 1s a s1m1lar view on an enlarged Secondly, the truck thus constructed and mounted serves 'as an adjustable stop to limit' the depth of cut of the abrasive drumand to thus insure smooth and uniform work.

Inaddition, the truck is in itself adjusth ably mounted so that it is allowed to rock transversely, of the body, thereby making it substantially self-leveling, to compensate for irregularities on the surface. f v l Theimproved machine is further individ-V ualized by the presence of a manually manipulated means located on the handle for conveniently adjusting the aforesaid jack struc ture and locating the truck in the most appropriate position to fulll the requirements of the improved conception.

In the accompanying drawings Figure'l is a side v iewwith one siderof the body removed to expose and to permit clear observation of the drive and other -descale, showing principally the features ofthe wheeled truck and ]ack mounting or connection. l

Fig. 3 is a transverse section through the structure with the predominating partof the jack and truck emphasized.

Fig.4 isa plan view ofthe truck.v -Fi 5 is a side elevational view on. a- 'rei duce lscale of the complete drum machine,

constructedin accordance with the* present,

invention.

Fig. 6 is an exaggerated elevational view of d a 'fragmentary portion of jack structure, and

pivotally mounted truck, showing a slightly different embodiment .of the invention.

A prominent Cpart of the machine com rises v ly designat the partbroa ed as. the ody.

Specifically, this body is inv the formpffa, novel casting,the principal portion of which comprises' 'a box-like housing, generally desi'gf` nated by the reference numeral- 6.

s is better apparent from Fig. 5, thishous-` ing is offtgeneral rectangular configuration and embo ies a ,substantially Hat top 7, de-

pending spaced parallel si'des 8, a straight rear end wall 9 and a downwardly and fory l wardly curved rontl portion includin -a sub-jy stantially' arcuate drum shield 10, (see ig. 1).`

whose mouth is located in close proximity to t-he horizontally disposed abrading drum 13. y

Incidentally, this 'drum'is rigidlyl mounted .in the housing beneath the shield 10 and be-v tween the side walls, and in practice, it is especially constructed to facilitate attachment and removal of the abrasive paper which is used thereon. This is a feature of special note which is covered in a co-pending applicat-ion filed under date of Januaryu 26, 1928,

and designated by Serial No. 249,649.

Suitably fastened to the rear wall 9 of the housing is a bracket of appropriate construction including -a 'portion 14 upon which a caster 15 is swivelly mounted. This is' a singlewheel caster, and is located centrally of the wall 9, and it cooperates with the abrading drum 13 in supporting the'entire body and parts associated with the latter under predetermined conditions. Also associated with `the bracket is a handle 16 which is here shownl as being channel-shaped in cross section, and rigidly' mounted so that the machine can be conveniently propelled across the surface.

It might be added that the bracket includes an internally screw threaded boss 17, which 4 is in alinement with the screw threaded open- Y the housing,'and carries-a driving gear 25 f ing in the wal'l 9, and this opening together with the boss serves to accommodate a screw threaded bushing 18,' having a linger gripy ping flange at the outer end. This serves a purpose to be hereinafter described.

Supported on the central portion of the top plate of the housing is a conventional electric motor 19, equipped with a driving gear 20 in mesh with a smaller gear 21, which serves to drive the fan of thedust collecting device in an obvious manner. Mounted on the motor shaft below the gear 2O is a beveled power take-off gear 22, in mesh with a vertical complemental beveled gear `23 on the shaft 24 (see Fig. 3).

The shaft extends through one side wall f which is in mesh with complemental gears 26 and 27 located in the sidelhousing 28. We thus provide a gearing train which serves to take power from the shaft 24, and to transmit it to the aforesaid abrading drum 1 3.

Attention is now invited especially to Fi 3, wherein it will be observed that the truc comprises an arced axle or yoke 29 whose central portion is provided with upstanding lugs 30, and whose depending arm portions are provided with axles on which the small surface engaging wheels 31 are mounted.

As shown better in Fig. 2, this truck is con nected with the body, through the medium of what may be designated as a jack mounting or connection. As the name implies, this jack is intended for` raising and lowering the truck with respect to the body so that the truck wheels may be projected down and beyond the bottom of the body or may be withdrawn entirely into thebody.

As shown in Fig. 2 the jack includes a cylindrical stem guide 32 formed integral with and depending from the top plate of the housing,` in advance of the elcctrlc motor driving` gears. As shown in Fig.`3, this guide includes on one side, a horizontal bearing 33, andis further equipped with outsanding horizontally disposed lugs 34, which function as spring abutments.

In connection with bearing 33 as shown in Fig. 3, we desire to call attention to the com-4 rocking connection between the stub axle and the jack standard. The standard is held against rotation `by-the stem of a screw 40, fitting into a groove 41 in one side of the standard. The diametrically opposite side of the standard is provided with teeth 42 forming a vertical raising and lowering rack.

Closely associated with the rack,is a crank arm 43 fastened by a clamp 44 to the rock shaft 36, and maintained against accidental displacement by a set screw 37. This crank arm 4has its forward end extending through an opening'45 in the guide cylinder, and equippedrwith a gear segmentA 46, the teeth of which are in mesh with the aforesaid rack teeth. 1 Y

When 'the arm 43 israised up .or down, a corresponding sliding movement is givenv the standard 37 therebyraising or lowering the truck according to the direction of movement of the standard. Convenient means is provided for operating the jack from' a distant point, and preferably this means is controlled from mechanism on the handle. The means comprises a lever 47 (see Fig. 1), which has EMP,

and then up between the flanges of the handle 16 as indicated in Fig. 1.

At its upper end, it is connected with an actuating arm 53, pivotally mounted on the handle by suitable lneans and carrying an appropriate retaining latch 54 held in adjusted position by the segmental keeper 55, (see Fig. 1) `It will be seen that bymoving the handle 53'up or down, the lever 47 will be'actuated and will vimpart movement to the rod 52. It is obvious also that when the lever is rocked, the shaft 36 will be rocked also, and this will in turn actuate the arm 43 to operate the jack. The lever and operating rod constitute what is broadly designated as the manual means for actuating the jack. I

Associated with the manual means, is a self-acting or substantially automaticm'eans to aid in the operation of the ack. This means includes the aforesaid screw threaded bushing 18, shown in Fig. 1, and a freely slidable rod 56 -which has' its lower pointed end fitting into a depression in the wing 49 shown the head 38 is equipped with a pair of out-4 "standing lugs 61 -which overlie the truck axle' in Fig. 3, and also in Fig. 1.

The upper end of the rod is slidable thru an opening .in the head of the bushing, and

A'the lower end is provided with a shoulder 57 against which the lower end of a coiled spring 58 bears. This coiled spring surrounds the rod 56 and bears at its upper end against the bushing 18. It is obvious however, that the adjustment of the bushing merely serves to regulate the tension of the spring and the spring in turn bears upon the rod, and the rod exerts a yielding thrust upon the depending wing of thelever, thus exerting a normaldownward pressure on thev lever and a consequent upward swinging motioni on the crank arm 43, tending `to raise the standard inthe guide cylinder. Y

Counteractin the action of the spring 58, we find apa-ir o vertical springs 59, (see Fig. A 3)-, which are'interposed between the outstanding lugs 34, on the guide cylinder, and

the axle 2 9 on'the truck. IIn this connection,

it will lbe noted that the axle carries. adjusting screws 60 with which the lower ends of .the springs coact, while.- the springs bear at their Aupper ends against the lugs 34.

In this same-figure, it will be noticed that and-provide stop shouldersfor the adju-sting v screws 62.These ldetails obviously serve to regulate the rocking motion of the truck-l In other words, the truck has sidewise rocking Y motion which is regulated by the screws 62 and, abutmentjlugs 61.

In addition, the coiled springs 59 cooper- -ate in resisting the rocking motion of thel truck so that it is substantiallyself-leveling. As before intimated, these springs 59 not only act inthe capacity of rendering the self-ad- 4justment features of the truck yieldable, but they counteract 'tof the certain extent, the

action of the aforesaid spring 58. In other words, the spring 58 has a downward thrust upon the lever 47, thus raising vupwardly on the ack standard, while the springs 59 tend to adjust the truck by forcing it downwardly.

By proper adjustment of the springs, equalistructure, it will be understood, is not only that of adjusting the elevation of the body or frame in order to change the pressure'and the surfacing of the drum, but to improve upon the eiiciency of operation of the tilting type of floor surfacing means such as includes an eight-inch revolving drum. The, pres.- sure feature is accomplished by distribnting the ventire weight of the machine in such a manner that when the machine is not being operated, it will rest upon the truckand the rear caster.

However, it is possible to gradually or.V

otherwise, at the will of the operator, place approximately 7 v5% of the entire weight of the body and motor upon the surfacing drum.

. The principal purpose of this improved Aes This is made possible by locating the truck Y A in advance of the center of gravity of the entire load, and greatly'forward from the rear caster. In other words, the truck is located between the center of gravity and the valo-f Vrasive drums. ordinary conditions, with the drum oif of the floor as caused by a slight clearance, we have a three-point support, namely, the two truck wheels, and the caster. Thus the machine .can be easily pushed about from place to lace. y :When it i's desired to Vsurface the floor, the

manually manipulated retaining .means is actuatedin such away as to elevate the jack and the truck carried thereby. This allows the truck to be retracted into the hollow housing and to. transfer the weight of a ,greater portion thereof to the abrasive drum. The

It is obvious then, that under ns A abrasive ydrum surfaces until the truck wheels f Y l again come into contact with the floor. In this res ect, the truck wheels have the additional unction of adjustable gage elements.

principal portions, afbox-like housing which y constitutes a shield for the'majority of the parts as well as the rotary abrading-drum.

The motor constitutes thesource ofi/power,

This permits the depth of the cut Vto be regulated. The result is that this improvedl machine ,requires '4 only a minimum expendiand provides a weight which is transmitted to the drum, when the truck is retracted into the housing, to insure a more tenaciousabrading contact with the floor. The drum is rigidly mounted in the housing and is vertically liftable -with the latter.

The caster aids in supporting and pro-l pelling the machine, and 1s preferably of the single type and located on the rear center of the housing. `This caster,` however, supports but a portion of the weight. The

wheeled truck is self-leveling, bodily adjustable in a vertical direction, provides a depth gage for the abrading action of the drum, a yieldable stop, and is the principal transporting means for the machine. These, together with the other structural features between the' manual adjusting and retaining structureand the truck which is adjustably and pivotally mounted thereon. From theV details already described, it is obvious that A the standard of the jack and the truck which is pivotally mounted thereon are adjustable as a unit. Moreover, screws are provided for swinging the truck about its fulcrum or pivot and retaining it in adjusted position. Then too, the spring means is interposed ber, tween the 'jack and truck to bring about the aforesaid yieldable result.

In Fig. 6 the result is accomplished thru the medium of a slightly different structure, wherein the jack cylinder is designated by the numeral 32, this being provided with outstanding lugs 34 constituting spring abutments. In this instance,the lugs are formed with depressions providing shallow4 sockets 63. The truck wheels 31a, are mount# ed on the arched axles 64 whose central portion is ribbed and fashioned to provide a portion of fa pivotal connection between the trucks and the standard 37a of the jack.

In this particular instance, the standard is provided withspaced parallel ears 65 at its lower end which straddle the ribs on the arched axle and which carry inturned lcylindrical studs 66' providing pivotal mountin-gs."

The standard is additionally provided with extensions or arms 67, apertured at theirv outer ends to slidably receive the lower re-k duced ends of the vertical spring pins 68.

Incidentally, these pins are provided at their upper ends with heads 69 receivable in lthe' aforesaid socket 63. Then too, the coiled spring 7 0 surrounds the' pins in each instance, bearing at their upper ,ends against the head 69 and at their lower ends against the extensions 67.

These extensions serve additionally as ed with said standard.

abutments against which the adjusting screws 71, carried bythe axle, bear. Thus, in a broad sense we have spring means between the abutments, on the jack cylinder operating indirectly upon the truc Having thus described our invention, what we claim as new is 1. In a surfacing machine of the class described, a body, a surfacing drum rotatably mounted on the forward end of the body, a guiding caster swivelly mounted on the rear end portion of the body, va handle connected tothe rear end portion of the body, a motor supported. on the top of the body and centrally located, a driving connection between the motor and said drum, a jack including a cylinder integral with the body, a standard slidably mounted in the cylinder, a wheeled truck disposed transversely of the body and in close proximity to'said drum, said truck embodying .an arched axle pivotally connect- 2. 4In a surfacing machine of the class described, a body, a surfacing drum' rotatably mounted on the forward end of the body, a guiding caster swivelly mounted on the rear end portion of the body, a handle connected to the rear-Vend portion of the body, a motor .supported on the topof the body and cender, and coiled springs associated with said axle and abutments and bearing at their upper ends against said abutments.

3. In a surfacing machine of the class described, a body, a surfaeing'drum rotatably mounted on the forward end of the body, a caster swivelly mounted on the rear end of the body, a handle rigidly connected to the rear end portion of the body, a 'ack structure including a cylinder formed integral with and depending from said body, a standard slidable in said cylinder, a wheeled truck mounted on the lower end of the standard, a rock shaft supported for oscillation on said body adjacent said cylinder, a crank arm carried by said rock shaft, an operating connection between the crank arm and said standard, a lever fastened to said rock shaft, and operating means for the lever mounted on said handle.

4. In a surfacing machine ofthe class described, a body, a rotary surfacing drum carried by said body, a wheel support carried by the body, a handle carried by the body, va jack structure embodying a cylinder mounted on the body, a standard slidable in said cylinder,

IRO

. a wheeled truckincluding an arched axle,

pivotally connected to the lower end of said standard, outstanding spring abutments carried by said cylinder, springs interposed between said axle and jack and bearing at their upper ends against said abutments, outstanding lugs carried by said standard, and adjustable stop screws carried by said axle and cooperable with said lugs, whereby to provide a substantially self-leveling yieldable truck on the lower end ofthe jack standard.

5. In a surfacing machine of the class described, a body, a surfacing drum carried by the body, a guide 'caster carried by the body and swivelly mountedV thereon, a handle mounted on the body, a jack structure comprising a cylinder formed integral with and depending from the body and provided in one side with an opening, a tcylindrical standard slidable in said cylinder and having rack teeth on one side opposite said opening, a truck mounted on thelower end of the standard, a rock shaft journaled for oscillation and bearing on said body adjacent said cylinder, an armcarried by said rock shaft, and having a gear segment extending through said opening with its teeth in mesh on the rack teeth, a lever carried by said rock shaft,

.and operating means for the lever located on said handle. e

6. In a surfacing machine of the class described,a body, .a surfacing drum carried by the body, a guide caster carried by the body and swivelly mounted thereon, a handle mounted on the body, a jackv structure com'-v prising a cylinder formed integral with' and depending from the bodyl and 'provided in one side with an opening, a cylindrical standard slidable in said cylinder, and having rack teeth on one side registering with said open-1 ing, a truck mounted on the lower end of. the standard, a rock shafttjournaledfor oscillation in a bearing on said bodygadjacent said treating drum mounted on the forward end portion of the body, a guiding and supporty I ing caster -Swivelly mounted on the rear end portion of the body,`a motor supported on top of the body between the caster and drum, a handle fastened to the rear end portion of the body adjacent said caster, awheeled truck, and mounting and adjusting means for tures..l HARRY H. WOLFE.Y

HARRY L. MYERS. l

cylinder, anarm carried Aby said rock shaft and having a gear segment extending through said opening with its teeth in mesh with the*- ra'ck teeth, a lever carried byjsaid rock shaft.,Y A 'l operating means for the lever located on said handle, together with auxiliary spring means associated with the lever and'body 'and inf cludingadjusting means. e

7. In a surfacing machine of the .de-jA a rotary abradjn'g drum scribed, a body 00 .l supported on. the body, a handle connected to the body, a guide caster swivelly mounted on the body, ,a raising and lowerin jack' comprising a cylinder, a standard sli and a wheeled truck pivot-ally mounted'on the lower end of the standard, and a spring means interposed between the truck ud jack,

vand exerting pressure -upon the truck to yieldably resist pivotal motion of the truck.

cylinder, operating means-'for the standard,

plm 

